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Questions and Answers
Enthalpy of an ideal gas is a function only of ________
Enthalpy of an ideal gas is a function only of ________
Temperature
Which of the following is the most efficient thermodynamic cycle?
Which of the following is the most efficient thermodynamic cycle?
- Diesel
- Brayton
- Otto
- Carnot (correct)
What is the law of thermodynamics?
What is the law of thermodynamics?
- Energy can neither be created nor destroyed (correct)
- Entropy of the universe is increased by irreversible processes
- Internal energy is due to molecular motion
- Heat energy cannot be completely transformed into work
An ideal gas is compressed isothermally. What is the enthalpy change?
An ideal gas is compressed isothermally. What is the enthalpy change?
Name the process that has no heat transfer.
Name the process that has no heat transfer.
An ideal gas is compressed in a cylinder insulated so that there is essentially no heat transfer. The temperature of the gas:
An ideal gas is compressed in a cylinder insulated so that there is essentially no heat transfer. The temperature of the gas:
What is the SI unit of pressure?
What is the SI unit of pressure?
The equation Cp=Cv+R applies to which of the following?
The equation Cp=Cv+R applies to which of the following?
In the flow process, neglecting kinetic and potential energy, the integral of Vdp represents what?
In the flow process, neglecting kinetic and potential energy, the integral of Vdp represents what?
Mechanical energy of pressure transformed into energy of heat.
Mechanical energy of pressure transformed into energy of heat.
The theory of changing heat into mechanical work.
The theory of changing heat into mechanical work.
Average pressure on a surface when a changing pressure condition exists.
Average pressure on a surface when a changing pressure condition exists.
Which of the following cycles consists of two isothermal and two constant volume processes?
Which of the following cycles consists of two isothermal and two constant volume processes?
A control volume refers to what?
A control volume refers to what?
In the polytropic process, PVⁿ=constant, if the value of n is infinitely large, the process is:
In the polytropic process, PVⁿ=constant, if the value of n is infinitely large, the process is:
If the temperature is held constant and the pressure is increased beyond the saturation pressure, then the working medium must be:
If the temperature is held constant and the pressure is increased beyond the saturation pressure, then the working medium must be:
Is one whose temperature is below the saturation temperature corresponding to its pressure?
Is one whose temperature is below the saturation temperature corresponding to its pressure?
Number of molecules in a mole of any substance is a constant called ________
Number of molecules in a mole of any substance is a constant called ________
If the pressure of a gas is constant, the volume is directly proportional to absolute temperature.
If the pressure of a gas is constant, the volume is directly proportional to absolute temperature.
The number of protons in the nucleus of an atom or the number of electrons in the orbit of an atom.
The number of protons in the nucleus of an atom or the number of electrons in the orbit of an atom.
In a P-T diagram of a pure substance, the curve separating the solid phase from the liquid phase is:
In a P-T diagram of a pure substance, the curve separating the solid phase from the liquid phase is:
The latent heat of vaporized in joules per kg is equal to _______
The latent heat of vaporized in joules per kg is equal to _______
From of energy associated with the kinetic energy of the random motion of a large number of molecules.
From of energy associated with the kinetic energy of the random motion of a large number of molecules.
If the temperature is held constant and the pressure is increased beyond the saturation pressure, then the working medium must be:
If the temperature is held constant and the pressure is increased beyond the saturation pressure, then the working medium must be:
Is the condition of pressure and temperature at which a liquid and its vapor are indistinguishable.
Is the condition of pressure and temperature at which a liquid and its vapor are indistinguishable.
When a substance in gaseous state is below the critical temperature it is called _________
When a substance in gaseous state is below the critical temperature it is called _________
Superheated vapor behaves:
Superheated vapor behaves:
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Study Notes
Thermodynamics Study Notes
- Enthalpy of an Ideal Gas is a function of temperature.
- The Carnot cycle is the most efficient thermodynamic cycle.
- The First Law of Thermodynamics states that energy can neither be created nor destroyed.
- Isothermal compression of an ideal gas results in zero enthalpy change.
- Adiabatic process involves no heat transfer.
- Compressing an ideal gas adiabatically increases its temperature.
- The SI unit of pressure is Pascal (Pa).
- The equation Cp = Cv + R applies to ideal gases.
- The integral of Vdp in a flow process represents shaft work.
- Mechanical energy transformed into heat is represented by enthalpy.
- Thermodynamics is the theory of changing heat into mechanical work.
- Mean effective pressure (MEP) is the average pressure in a changing pressure condition.
- The Stirling cycle consists of two isothermal and two constant volume processes.
- A control volume is a fixed region in space.
- In a polytropic process (PVⁿ = constant), if n is infinitely large, the process is isometric.
- A compressed liquid exists if the temperature is held constant and the pressure is increased beyond the saturation pressure.
- A subcooled liquid is below the saturation temperature corresponding to its pressure.
- Avogadro's Number is the constant number of molecules in a mole of any substance.
- Charles's Law states that at constant pressure, volume is directly proportional to temperature.
- The Atomic Number is the number of protons in an atom's nucleus.
- The Fusion Curve separates the solid and liquid phases on a P-T diagram.
- The Latent Heat of Vaporization is approximately 22.6 x 10^5 joules per kilogram.
- Heat is a form of energy resulting from the random motion of molecules.
- A compressed liquid exists if the temperature is held constant and the pressure is increased beyond the saturation pressure.
- The Critical Point is the condition where a liquid and its vapor are indistinguishable.
- A vapor is a substance in the gaseous state below its critical temperature.
- Superheated vapor behaves approximately as a gas.
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